The
ElectroLuminescent Display is
built on the same
principle
as
electroluminescent backlight panels. To
build an ELD you
start
with a
substrate of
plastic or
glass. On this
substrate you
make
thin parallel transparent electrodes(this can be made from
indium
tin oxide). Then
commes a
layer of
phosphor. By using
different phosphor compounds we can
select the
colour of this
display.
To make a
multicolour display, we use
phosphor with a red glow
on one
line,
green on the
next, then
blue and so on.
Over this a
plastic layer with another set of
electrodes is put.
These
electrodes are turned 90
degrees in
relation to the one on the
substrate. This makes a
simple coloumn/
row grid where any
phosphor point can be selected. The whole
assembly is then
connected
to
proper driver electronics.
The ELD can
operate in a wide
temperature range and
has low
power consumption. Since ELDs are
completely
solid-state they have a good
reliability. The
Active Matrix ELD
is a further
development of this
technology.